Paving machinery.



No. 853,131. PATENTED MAY 7, 1901 F. B. SMITH. PAVING MACHINERY.

APPLICATION EILBD 3111431, 1906.

3 SHEETS-SHEET 1.

FICTC Z WIYI'N ESSES; q I INVENTOR;

f/FAAWfl SM/71 E mamas PETERS cm, WAsHlNcroN, D c.

PATENTED MAY 7, 1907.- F. B. SMITH. PAVING MACHINERY. APPLICATION TILEDJAN. 31, 19 06.

3 SEBETS-S HEET'2.

gff, m )3 i THE NORRIS PETERS cc), WASHING'FGN. n. c.

7 0 9 1 7 Y A M D E T N E T A P H m I M 3 K. 1 3 3 r0 8 N PAVINGMAGHINERY. APPLIOATIOBI FILED JAN. 31, 1006.

3 SHEETS-8H3 3.

FIG: 27;

INVENTOR WITN E2 iii 2% n1: NORRIS PETERS cc.,'wAsH|NG1oN. 0. c4

, city. In a prior patent obtained by myself UNITED srArEs PATENT FFIOE.I

FRANK B. SMITH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR TO THE BARBERASPHALT PAVING COMPANY, OF PHILADELPHIA, PENN SYL- VANIA, AOORPORATIONOF WEST VIRGINIA.

PAVlNG MACHINERY.

N 0. 853,131. Specification of Letters Patent. Patented May 7, 1907.

T0 at whom it may concern:

I tus there is erected the usual asphalt tank Be it known that I, FRANKB. SMITH, of i and upon the other side the usual sand heat-Philadelphia, in the State of Pennsylvania, l ing apparatus, but thesebeing of well known have invented certain new and useful Im constructionI have not shown them in the provements in Paving Machinery, whereof Idrawings of this case and will not here dethe following is avspecification, reference bei scribe them. They may be used as shown inghad to the accompanying drawings.

, My invention relates to improvements in apparatus for preparing themixtures of asphalt and sand which are commonly used for pavingpurposes, and is more specifically adapted (although not limited) tothat type of apparatus known as portable or railway plants wherein allthe required apparatus-is permanently and operatively mounted upon asuitable car for transportation from city to above referred to.

From the sand heater or drum the sand is delivered by way of a spout 2,(Fig. II), to a .Iotary screen 3, situated close to the floor of thecar. This screen is in no wise connected with the sand drums, but ismounted in a separate covered cradle, and is driven independently of thedrums,.being thus protected against the destructive effects of theproducts of combustion sent through the drums for the purpose of heatingthem. Below this screen and let into the floor of the car are two smallhoppers of which the larger one 4, receives the screened heated sand,while the smaller one 5, receives the tailings and discharges them uponthe ground through a spout 6. In close proximity to the sand screen isthe elevator frame 7, containing the extensible upper portion 8. Withinthis frame is mounted an endless bucket chain, 9, with the customarydriving connections.

in conjunction with Henry R. Kasson, No. 783,146, dated February 21st,1905, I show and claim such a portable asphalt plant. In all suchportable plants a problem is presented in finding a suitable locationfor the screen and hot storage bin; the necessary limitations of arailroadplant preventing them from conveniently occupying the elevatedposition commonly assigned to them in permanent plants.

My present invention consists in certain improvements in such a plant asgenerally described in the above referred to patent, and has referencemore specifically to a novel position and operation of the screen, theemployment of a charging spout suspended from the hot sand elevator, theinterposition of an overflow spout, the arrangement of the stor age bin,and its preferably extensible character, and the employment of aseparate gasolene engine for the purpose of operating the plant.

In the accompanying drawings, I have illustrated and will now describe apreferred ower end. This spout is ca able when the form of constructionin which I embody my gate is closed of holding wit lin itself morepresent improvements. 7 than the nine cubic feet of sand which in Insaid drawings, Figure I, is a plan view, customary usage formsffonecharge for the and Fig. II, a side elevation of the parts of a sand box.Below the charging spout is the portable asphalt plant to which myinvenoverflow spout 14, opening from the lower tion relates. Fig. III,is a detailed view of side of the angle between the charging spout themechanism for extending the elevator. and the elevator frame, in suchposition that Fig. IV, is a sectionalyiew of the extensible as soon asthe charging spout has been filled, or telescopic sand reservoir. allfurther sand delivered to it by. the ele- The mechanism shown is allmounted upon vator must pass into the overflow spoutfij the floor 1, ofan open car body and near the will be noticed in Fig. I, the two spoutsare center thereof. On one side of this apparadivergently directed sothat the charging Within and dips below the frame of the car. It isprovided with an opening 10, through which the hot sand from the hopper4, is admitted to the lower end of the elevator frame to be caught andraised by the suckets. The bottom of the elevator frame is provided witha sliding gate 11.

The top of the elevator frame is provided with two spouts of which theuppermost 12, is a charging spout of considerable length and in theprior patent to myself and Kasson The lower end of the elevator frame islet roportions provided with a gate 13, at its hot sand spout 12,discharges directly above the measuring box 15, which is of the usualconstruction to contain nine cubic feet of sand. On the other hand theoverflow an elevated position over the mixing platform but it will benoted that in this case, no such structure is employed, but merely anappendage of the extensible portion of the hot 'sand elevator towhichlalone the charging spout is attached and by which it is supported.In this way I have been able to se cure the practical advantages of theelevated storage bin, while doing away with the disadvantages of acumbrous elevated structure upon the railroad plant which must beremoved whenever the car is placed in transportation. 7

The measuring box 15, is provided with meansflifor emptying its contentsinto the mixer 18.

'19, is the pipe by'which asphalt is fed into the mixer from the asphalttank.

In the operation, as distinguished from the transportation of the plant,the sand box and mixer are projected from the side of the car, beingmounted on a: truck 20, with rollers 21, running on the removable Ibeams 23. Thus the mixer, which empties at the bottom may discharge itscontents directly into a wagon extending beneath, and the mixture becarried to the work. g

The hot sand reservoir 16, has a sloping bottom 24, and is provided atits lower end with a spout 49, which returns heated sand from thereservoir directly to the bottom of the elevator frame where it is againfed to the buckets.-

For the operation of the machine I provide a com act gasolene engine 25,mounted along side 0 the hot sand reservoir. The shaft 26, of thisengine is geared to acom lementary shaft 27. A sprocket chain 28, rivenfrom the shaft 27, operates the geared shafts 29, and 30, which carrythe stirring blades mounted within the mixer 18, which is shown of theordinary twin-plug variety.

The sprocket chain 31, driven from the shaft 27 serves to drive therotary screen 3. The shaft 26, drives the sprocket chain 32, by which iso erated the blower 33, of the sand drums. e shaft 27, is connected bybevel gears 38, 38, to the transverse shaft 39, which drives a sprocketchain 40, by which the elevator is operated. The shaft 39, is connectedby sprocket chain 41, with a short twin-shaft 42, provided with bevelgear 43, by which the sand drums are operated.

In Fig. III, there is shown in detail the mechanism employed forextending the eleis in motion it is necessary vator prior to theoperation-of the plant. As heretofore explained this elevator istelescopic and when the car is traveling and the plant not in use, itsupper portion is allowed tend the telescopic end a small winch 44, is

permanently attached to the. side of the elevator the rod or cord ofwhich 45, passes around the rollers 46, and 47, and is then attached tothe lower endof the upper ex tensible member of the elevator frame.

In Fig. IV, there is disclosed in section the construction of the hot byit is rendered telescopic. When the plant for the mixer and measuringbox to be moved from their overhanging position and run onto the body ofthe car, directly over the sand reservoir. When this has been done theprojecting extremities of the beams 23, are unbolted and removed. But onaccount of its size, the sand reservoir 16, would forbid this motion,were it not capable of being telescoped. Accordingly, it is made asshown in Fig. IV, in three sections, each of smaller size than the otherand capable of being received one within the other. When thus depressed,the sand reservoir is such as to permit the sliding of the sand box andmixer directly over it.

IIaving thus specified the parts, and preferred construction of myinvention I will now explain its operation and'advantages In theoperation of these cars it is usually essential that from the drumshould be continuous, otherwise a uniform temperaturefor the sand can- 5movements of the carts by not be secured. On the other hand, owing tothe irregular which the asphalt mixture is transported from the plant tothe streets of the city where it is to be laid, the removal of themixture from the (plant is necessarily more or less intermittent. By myimprovements the heat ed sand which is continuously delivered from thedrum, after being screened, is as continuously raised by the elevatoranddelivered into the charging spout 12. This charging fill themeasuring charges, so that when the carts are comin in rapidly and theplant working to its fufi extent, the measuring and successively filledcubic feet of sand. If the transporting wagons do not arrive withsufficient regularity the sand which is raised by the elevator overflowsfrom the charging spout into the overflow spout 14, by which it isdelivered into the hot sand reservoir 16, the capacity of which is greatenou h to provide a very considerable storage of the plant is runningrapidly may be used by sand reservoir wherethe height of I box can berapidly with the desired nine the feeding of heated sand .115 spout hassufficient capacity to more than.

box 15, into which it dis hot sand, which when feeding the sand from itsbottom by the spout 49, into the elevator in order to temporarilyincrease the supply to the elevator and consequently to the chargingspout.

'This large hot. sand reservoir is further useful in regulating thetemperature of the sand, for the reservoir, although of coursemaintaining the sand at a high temperature for many hours, will as arule contain cooler sand than that which is fed directly from the drum.If therefore, the sand from the drum is a little too hot a properadmixture of cooler sand from the reservoir 16, is permitted, wherebythe required temperature may be secured with greater precision.

Having thus described my invention, I claim 1 In an asphalt plant, thecombination of the elevator, and measuring box, with provision of acharging spout for the elevator discharging into the measuring box; ahot sand reservoir; and an overflow spout for the elevator dischar inginto the hot sand reservoir, substantial y as set forth.

2. In an asphalt plant, the combination of a sand elevator; means forfeeding heated sand to the bottom of the elevator; a charging spout atthe top of the elevator, of suflicient capacity to contain more thannine cubic feet of sand and provided with a gate at its lower end; andan overflow spout at the top of the elevator opening from near the'topof the charging spout so as to receive sand only when the charging spoutis filled, sub stantially as set forth.

3. In an asphalt plant, the combination of a sand elevator with acharging spout at its top; means for supplying heated sand thereto; asand measuring box into which the char ing spout of the elevatorempties; an over ow spout leading from the upper end of the chargingspout and diverging in direction therefrom; a hot sand reservoir intowhich the overflow spout discharges; and means for returning the sandfrom the reservoir to the bottom of the elevator, substantially as setforth.

4. In a portable asphalt plant, the combination of a car, means forcontinuously heating and feeding sand; a rotary screen cradledindependently of the heating apparatus near the floor of the car; a sandelevator running from below the surface of the car to a higher point;and a hopper below the screen discharging continuously into the bottomof the elevator, substantially as set forth.

5. In a portable asphalt plant, the combi* nation of a car, a sandelevator, a sand reservoir, and a measuring box, the measuring box whenin use being alongside of the sand reservoir means for diverting thesand from the top of the elevator either to the measuring box or to thesand reservoir; the sand reservoir being upwardly extensible whereby itscapacity may be enlarged when in use, while when the car is beingtransported-it may be collapsed so as to permit the sand measuring boxto be carried over it, substantially as set forth.

6. In a portable asphalt plant, the combination of a car, a sandmeasuring box and mixer mounted upon a laterallymoving truck; meanswhereby when the plant is in operation this truck with its measuring boxand mixer may be projected'laterally from the car to facilitate thedischarge therefrom; an upwardly extensible sand reservoir which when inuse is enlarged in capacity by its upward extension, and situatedalongside of the sand measuring box and mixer as projected from the car,while when the car is being transported said reservoir may be collapsedto permit the withdrawal of the truck carrying the sand measuring boxand mixer from the side of the car to a position over the collapsedreservoir, substantially as set forth.

7. In a portable asphalt plant, the combination of a car, a sandelevator; a sand drum atone side thereof, whereby heated sand iscontinuously delivered to the bottom of the elevator; a sand screen; anasphalt tank at the other side of the elevator; a sand reser voir intowhich the elevator discharges; a sand measuring box and mixer which whenin use is mounted near the sand reservoir; and, a gasolene enginemounted near the sand reservoir whereby the drum, screen, elevator andmixer are operated, substantially as set forth.

In testimony whereof, I have hereunto signed my name, at Philadelphia,Pennsylvania, this 26th day of January 1906.

FRANK B. SMITH.

Witnesses:

JAMES H. BELL, E. L. FULLERTON.

